A5012950964- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Laser Material Processing Techniques
- Magnetic confinement fusion research
- Ocular and Laser Science Research
- Laser-Matter Interactions and Applications
- Phase-change materials and chalcogenides
- Ionosphere and magnetosphere dynamics
- Magneto-Optical Properties and Applications
- Surface Roughness and Optical Measurements
- Laser Design and Applications
- Optical Systems and Laser Technology
- Superconducting Materials and Applications
- Engineering Applied Research
- Glass properties and applications
- Real-time simulation and control systems
- Photonic and Optical Devices
- Quantum optics and atomic interactions
- Semiconductor Lasers and Optical Devices
- Neural Networks and Reservoir Computing
- Optical Network Technologies
- Nuclear Engineering Thermal-Hydraulics
K Lab (United States)
2020
DEVCOM Army Research Laboratory
2011-2019
Lehigh University
2006-2010
We present extensive stimulated Brillouin scattering (SBS) results from experiments and modeling for four different photonic crystal fibers (PCFs) with core diameters ranging 8 to 1.7 μm. These reveal several SBS characteristic features of small-core PCFs, high thresholds, acoustic peaks, which are due their antiguiding nature highly multimode character. The what we believe be new modes is examined in the light large variations observed gain, threshold, shift decreasing diameter optical wavelength.
Stimulated Brillouin scattering (SBS) generated from noise in small-core photonic crystal fibers (PCFs) exhibits a strong dependence on pump polarization. The polarization of two PCFs is investigated, yielding unexpected results. Both exhibit birefringence resulting 90° for the SBS and 3 dB difference threshold between polarizations corresponding to minimum maximum SBS, respectively. Surprisingly, transmission smaller-core fiber also 180° at lower powers due polarization-dependent loss.
Improved models are developed for integrated simulations of pedestal formation and edge localized mode (ELM) cycles at the H-mode tokamak plasmas. The is formed in when flow shear magnetic reduce transport driven by drift modes plasma (Pankin A Y et al 2005 Plasma Phys. Control. Fusion 47 483). large part produced diamagnetic poloidal velocity, which computed using a neoclassical model. Ion thermal reduced to near level while electron temperature gradient transport. relatively current...
We study through experiment, calculation and simulation the frequency dependence of depolarized GAWBS observed in four different photonic crystal fibers extend results to others simulation. In two studied, high modes (>; 1 GHz) are addition usual lower torsional radial (TR) modes. The acoustic responsible for characterized a combination simulations experiments. calculations done using silica rod approximation, which is valid PCFs with low intermediate air-fill fraction or very air-filling...
The continuous wave laser-induced damage thresholds of Schott chalcogenide glasses, IRG-24, IRG-25, and IRG-26, are measured for a 5s exposure 1.07 μm light focused to spot size with 1/e2 diameter 830 μm, following the International Organization Standardization standards.
Guided acoustic wave Brillouin scattering (GAWBS) in PCFs is altered by the air-silica structure of inner cladding and does not depend on diameter as with standard fibers. This dependence investigated.
A master-oscillator power-amplifier with stimulated Brillouin scattering (SBS) beam cleanup or wavefront reversal typically incorporates a Faraday isolator to outcouple the Stokes light, limiting power scalability. Volume Bragg gratings (VBGs) have potential for scaling higher powers. We report here results of tests on VBG designed resolve wavelengths 0.060 nm apart, corresponding 16 GHz frequency shift SBS backscattering at 1064 in fused silica. Such an element may also find use between...
Stimulated Brillouin scattering (SBS) generated from noise in small core PCFs exhibits a strong dependence on pump polarization. The birefringence of two is investigated, yielding unexpected results.
The continuous wave laser-induced damage threshold of chalcogenide glass, Ge28Sb12Se60, is measured for a 5s exposure 1.07 µm light focused to spot size with 1/e diameter 830 µm, following the ISO standards.
Faraday isolators limit the power-scalability of multimode MOPA systems that use SBS to restore diffraction-limited beam quality. We test a volume Bragg grating, more scalable alternative, designed separate wavelengths 0.0604nm (16GHz) apart.
SBS is studied in four different photonic crystal fibers with core diameters ranging from 8μm to 1.7μm. Of particular interest the observation of several peaks and their strong polarization dependence small PCFs.
We have investigated Stimulated Brillouin Scattering (SBS) in several different Photonic Crystal Fibers (PCFs). present results on a new peak these fibers and propose an explanation for its origin those fibers.
The continuous wave laser-induced damage thresholds of Amorphous Materials chalcogenide glasses, AMTIR-1, AMTIR-2, AMTIR-5, and AMTIR-7 are measured for a 5s exposure 1.07 μm light focused to spot size with 1/e<sup>2</sup> diameter 830 μm or 1044 μm, following the International Organization Standardization standards.